Over time, as you install and uninstall applications, the registry can become littered with old entries. These can cause error messages and slow the computer down. If you want ensure that your PC functions correctly, and remains fast, you'll need to clean it up.

Fortunately, you can clean your registry manually to remove leftover application entries after uninstalls and unnecessary start-up items. Just see Step 1 below to get started. Note: This article is meant for more experienced Windows users. If done improperly, trying this could cause problems with your computer.